343 lines
8.6 KiB
Go
343 lines
8.6 KiB
Go
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package lending
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import (
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"net/http"
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"time"
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"github.com/gin-gonic/gin"
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"github.com/gothinkster/golang-gin-realworld-example-app/common"
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"github.com/gothinkster/golang-gin-realworld-example-app/models"
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)
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// GetUserPosition returns user's lending position
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// GET /api/lending/position/:address
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func GetUserPosition(c *gin.Context) {
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address := c.Param("address")
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if address == "" {
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c.JSON(http.StatusBadRequest, gin.H{
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"success": false,
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"error": "wallet address is required",
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})
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return
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}
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config := GetLendingMarketConfig()
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position := &UserPosition{
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UserAddress: address,
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WalletAddress: address,
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SuppliedBalance: "0",
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SuppliedBalanceUSD: 0,
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BorrowedBalance: "0",
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BorrowedBalanceUSD: 0,
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CollateralBalances: map[string]CollateralInfo{},
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HealthFactor: 0,
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LTV: 0,
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SupplyAPY: config["base_supply_apy"].(float64),
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BorrowAPY: config["base_borrow_apy"].(float64),
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}
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c.JSON(http.StatusOK, gin.H{
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"success": true,
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"data": position,
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})
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}
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// GetLendingStats returns lending market statistics
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// GET /api/lending/stats
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func GetLendingStats(c *gin.Context) {
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config := GetLendingMarketConfig()
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stats := &LendingStats{
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TotalSuppliedUSD: 0,
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TotalBorrowedUSD: 0,
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TotalCollateralUSD: 0,
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UtilizationRate: 0,
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AvgSupplyAPY: config["base_supply_apy"].(float64),
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AvgBorrowAPY: config["base_borrow_apy"].(float64),
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TotalUsers: 0,
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ActiveBorrowers: 0,
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TotalTVL: 0,
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}
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c.JSON(http.StatusOK, gin.H{
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"success": true,
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"data": stats,
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})
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}
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// GetLendingMarkets returns lending market configuration.
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// Contract addresses come from system_contracts; static config from GetLendingMarketConfig.
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// GET /api/lending/markets
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func GetLendingMarkets(c *gin.Context) {
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db := common.GetDB()
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var lc struct {
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Address string `gorm:"column:address"`
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ChainID int `gorm:"column:chain_id"`
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}
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db.Table("system_contracts").
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Where("name = ? AND is_active = ?", "lendingProxy", true).
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Select("address, chain_id").
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First(&lc)
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config := GetLendingMarketConfig()
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config["contract_address"] = lc.Address
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config["chain_id"] = lc.ChainID
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c.JSON(http.StatusOK, gin.H{
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"success": true,
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"data": []interface{}{config},
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})
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}
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// SupplyUSDC handles USDC supply (deposit) transaction
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// POST /api/lending/supply
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func SupplyUSDC(c *gin.Context) {
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var req SupplyRequest
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if err := c.ShouldBindJSON(&req); err != nil {
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c.JSON(http.StatusBadRequest, gin.H{
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"success": false,
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"error": err.Error(),
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})
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return
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}
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// TODO: Validate transaction on blockchain
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// TODO: Update user position
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// TODO: Record transaction in database
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c.JSON(http.StatusOK, SupplyResponse{
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Success: true,
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Message: "USDC supplied successfully",
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})
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}
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// WithdrawUSDC handles USDC withdrawal transaction
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// POST /api/lending/withdraw
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func WithdrawUSDC(c *gin.Context) {
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var req WithdrawRequest
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if err := c.ShouldBindJSON(&req); err != nil {
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c.JSON(http.StatusBadRequest, gin.H{
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"success": false,
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"error": err.Error(),
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})
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return
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}
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// TODO: Validate transaction on blockchain
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// TODO: Update user position
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// TODO: Record transaction in database
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c.JSON(http.StatusOK, WithdrawResponse{
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Success: true,
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Message: "USDC withdrawn successfully",
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})
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}
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// SupplyCollateral handles collateral supply transaction
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// POST /api/lending/supply-collateral
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func SupplyCollateral(c *gin.Context) {
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var req SupplyCollateralRequest
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if err := c.ShouldBindJSON(&req); err != nil {
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c.JSON(http.StatusBadRequest, gin.H{
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"success": false,
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"error": err.Error(),
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})
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return
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}
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// Validate asset type - check against assets table
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if !ValidateYTToken(req.Asset) {
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c.JSON(http.StatusBadRequest, gin.H{
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"success": false,
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"error": "invalid collateral asset, must be a valid YT token (YT-A, YT-B, YT-C)",
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})
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return
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}
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// Get token info from database
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tokenInfo, err := GetYTTokenInfo(req.Asset, 0)
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if err != nil {
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c.JSON(http.StatusInternalServerError, gin.H{
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"success": false,
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"error": "failed to fetch token information",
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})
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return
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}
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_ = tokenInfo // Will be used for blockchain validation
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// TODO: Validate transaction on blockchain using tokenInfo.ContractAddress
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// TODO: Update user collateral position
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// TODO: Record transaction in database
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c.JSON(http.StatusOK, SupplyCollateralResponse{
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Success: true,
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Message: "Collateral supplied successfully",
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})
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}
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// WithdrawCollateral handles collateral withdrawal transaction
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// POST /api/lending/withdraw-collateral
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func WithdrawCollateral(c *gin.Context) {
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var req WithdrawCollateralRequest
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if err := c.ShouldBindJSON(&req); err != nil {
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c.JSON(http.StatusBadRequest, gin.H{
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"success": false,
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"error": err.Error(),
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})
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return
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}
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// Validate asset type - check against assets table
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if !ValidateYTToken(req.Asset) {
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c.JSON(http.StatusBadRequest, gin.H{
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"success": false,
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"error": "invalid collateral asset, must be a valid YT token (YT-A, YT-B, YT-C)",
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})
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return
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}
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// Get token info from database
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tokenInfo, err := GetYTTokenInfo(req.Asset, 0)
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if err != nil {
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c.JSON(http.StatusInternalServerError, gin.H{
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"success": false,
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"error": "failed to fetch token information",
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})
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return
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}
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_ = tokenInfo // Will be used for blockchain validation
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// TODO: Validate transaction on blockchain using tokenInfo.ContractAddress
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// TODO: Check if withdrawal is safe (health factor)
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// TODO: Update user collateral position
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// TODO: Record transaction in database
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c.JSON(http.StatusOK, WithdrawCollateralResponse{
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Success: true,
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Message: "Collateral withdrawn successfully",
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})
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}
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// BorrowUSDC handles USDC borrow transaction
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// POST /api/lending/borrow
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func BorrowUSDC(c *gin.Context) {
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var req BorrowRequest
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if err := c.ShouldBindJSON(&req); err != nil {
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c.JSON(http.StatusBadRequest, gin.H{
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"success": false,
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"error": err.Error(),
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})
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return
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}
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// TODO: Validate transaction on blockchain
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// TODO: Check collateral sufficiency
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// TODO: Update user borrow position
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// TODO: Record transaction in database
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c.JSON(http.StatusOK, BorrowResponse{
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Success: true,
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Message: "USDC borrowed successfully",
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})
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}
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// RepayUSDC handles USDC repayment transaction
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// POST /api/lending/repay
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func RepayUSDC(c *gin.Context) {
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var req RepayRequest
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if err := c.ShouldBindJSON(&req); err != nil {
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c.JSON(http.StatusBadRequest, gin.H{
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"success": false,
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"error": err.Error(),
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})
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return
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}
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// TODO: Validate transaction on blockchain
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// TODO: Update user borrow position
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// TODO: Record transaction in database
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c.JSON(http.StatusOK, RepayResponse{
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Success: true,
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Message: "USDC repaid successfully",
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})
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}
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// GetLendingAPYHistory returns historical supply/borrow APY snapshots
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// GET /api/lending/apy-history?period=1W&chain_id=97
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func GetLendingAPYHistory(c *gin.Context) {
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period := c.DefaultQuery("period", "1W")
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chainId := parseChainID(c)
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database := common.GetDB()
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var usdcAsset models.Asset
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if err := database.Where("asset_code = ?", "USDC").First(&usdcAsset).Error; err != nil {
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c.JSON(http.StatusInternalServerError, gin.H{"success": false, "error": "USDC asset not configured"})
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return
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}
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now := time.Now()
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var since time.Time
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switch period {
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case "1M":
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since = now.AddDate(0, -1, 0)
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case "1Y":
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since = now.AddDate(-1, 0, 0)
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default: // 1W
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since = now.AddDate(0, 0, -7)
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}
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query := database.Where("asset_id = ? AND snapshot_time >= ?", usdcAsset.ID, since).
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Order("snapshot_time ASC")
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if chainId != 0 {
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query = query.Where("chain_id = ?", chainId)
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}
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var snapshots []models.APYSnapshot
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if err := query.Find(&snapshots).Error; err != nil {
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c.JSON(http.StatusInternalServerError, gin.H{"success": false, "error": "failed to fetch APY history"})
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return
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}
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type DataPoint struct {
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Time string `json:"time"`
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SupplyAPY float64 `json:"supply_apy"`
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BorrowAPY float64 `json:"borrow_apy"`
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}
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points := make([]DataPoint, 0, len(snapshots))
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for _, s := range snapshots {
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points = append(points, DataPoint{
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Time: s.SnapshotTime.UTC().Format(time.RFC3339),
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SupplyAPY: s.SupplyAPY,
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BorrowAPY: s.BorrowAPY,
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})
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}
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var currentSupplyAPY, currentBorrowAPY float64
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if len(snapshots) > 0 {
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last := snapshots[len(snapshots)-1]
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currentSupplyAPY = last.SupplyAPY
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currentBorrowAPY = last.BorrowAPY
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}
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// APY change vs first point in period
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var apyChange float64
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if len(snapshots) > 1 {
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apyChange = snapshots[len(snapshots)-1].SupplyAPY - snapshots[0].SupplyAPY
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}
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c.JSON(http.StatusOK, gin.H{
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"success": true,
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"data": gin.H{
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"history": points,
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"current_supply_apy": currentSupplyAPY,
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"current_borrow_apy": currentBorrowAPY,
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"apy_change": apyChange,
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"period": period,
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},
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})
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}
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